Final answer:
The S2 dermatome is tested inferior to the gluteal region and involves sensory testing from proximal to distal areas of the back of the thigh and leg.
Step-by-step explanation:
To test for the S2 dermatome, one would assess the region inferior to the gluteal region. Dermatomes are specific segments of skin innervated by the sensory fibers of a single spinal nerve root. The S2 dermatome encompasses the area of skin that includes the back of the thigh, the knee, and portions of the lower leg and foot. During a sensory exam, a physician might apply a light touch stimulus, such as with a cotton-tipped applicator, to various locations on the skin to test for sensory deficits in these regions. Testing for changes in perception from proximal to distal locations within the dermatome can help determine if there are any neurological impairments associated with the corresponding spinal nerve.